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Thanks for posting your TV Fool report. It helps a great deal.
To answer your question re. preamp power supplies, you need to follow the manufacturer's instructions carefully in order to avoid sending power into the TV tuner. In some cases the preamp power supply could be damaged due to high current into a low DC resistance in the tuner input. In some cases, no damage will occur, but the DC current will magnetize the input transformer core in the tuner. If this is the case, the input transformer may not pass much signal to the internal stages of the tuner circuitry.
Preamp power supplies usually consist of a wall transformer, and a 'power injector' which may look like a splitter, but it's not a signal splitter. The power injector is designed to send power 'up' the coax while preventing signal from traveling into the wall transformer.
After looking at your TV Fool report and seeing the model number of the antennas you're using, I can see why you have had a hard time with WOI reception. Neither the GE antenna nor the RCA antenna are designed to receive real channels 2 through 6 (Low-VHF band).
A single combination UHF/H-VHF/L-VHF antenna would be able to get the job done... with no amplifiers needed.
Several 'all channel' antennas come to mind, Antennacraft C290, Channel Master CM-3016 and Winegard HD7010. Mounted outside in the clear, you should have enough signal power to drive at least four sets through a passive 4-way splitter.
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